Casio DT-X30 R-50C Especificações descarregar pdf (Página 119)

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2.10.2 GPS Function API

Latitude and longitude data are obtained using independent positioning to provide the following

functions.

• Obtains positional data from user application via the GPS intermediate driver (Windows

Mobile standard GPS interface)

• Displays satellite reception status with the GPS Information tool

Note:

Refer to “GPS Information” with the GPS Information tool for detail.

The GPS in

termediate driver provides GPS information in two ways.

• NMEA Format Data Output

• Positional Data using the GPS Intermediate Driver API

In addition, multiple user applications can simultaneously access the GPS intermediate driver to

obtain positional data.

NMEA Format Data Output

The NMEA is an abbreviation for National Marine Electronic Association which provides

electronic instrument and communication specification standards for shipping vessels. The

NMEA-0183 output protocol is a standard for GPS receiver and navigation equipment

communication via a serial port. It’s widely supported by GPS equipment.

NMEA data can be output by accessing the GPS Intermediate driver’s virtual COM port (COM8).

Note:

The integrated communication port is as follows.

Table 2.84

GPS intermediate driver virtual serial port : COM8

The procedure for using the virtual serial port is as follows.

1. Open the virtual COM port with CreateFile().

2. Read the NMEA character string with ReadFile().

3. Analyze the NMEA character string to retrieve the positional data.

4. NMEA character strings are continually output for each GPS Module measurement. Repeat

steps 2 and 3 above as required to retrieve continuous positional data.

5. Close the port with CloseHandle().

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